<h2>DESCRIPTION</h2>

<em>i.group</em> allows the user to collect raster map layers in an imagery
group by assigning them to user-named subgroups or other groups. This
enables the user to run analyses on any combination of the raster map layers
in a group.  The user creates the groups and subgroups and selects the
raster map layers that are to reside in them. Imagery analysis programs like
<em><a href="g.gui.gcp.html">g.gui.gcp</a></em>, 
<em><a href="i.rectify.html">i.rectify</a></em>,
<em><a href="i.ortho.photo.html">i.ortho.photo</a></em> and
others ask the user for the name of an imagery group whose data are to be
analyzed. Imagery analysis programs like
<em><a href="i.cluster.html">i.cluster</a></em> and 
<em><a href="i.maxlik.html">i.maxlik</a></em> ask the user for the imagery group
and imagery subgroup whose data are to be analyzed.


<h2>NOTES</h2>

The <em>i.group</em> options are only available for 
imagery map layers in the current LOCATION_NAME.

<p>Subgroup names may not contain more than 12 characters.

<h3>EXAMPLE</h3>

This example runs in the "landsat" mapset of the North Carolina sample
dataset. The following command creates a group and subgroup containing
only the visible light bands of Landsat-7:

<div class="code"><pre>
i.group group=vis_bands subgroup=vis_bands input=lsat7_2000_10,lsat7_2000_20,lsat7_2000_30
</pre></div>

<h2>SEE ALSO</h2>

The GRASS 4 <em>
<a href="https://grass.osgeo.org/gdp/imagery/grass4_image_processing.pdf">Image
Processing manual</a></em>

<p><em>
<a href="g.gui.gcp.html">g.gui.gcp</a>,
<a href="i.cluster.html">i.cluster</a>,
<a href="i.maxlik.html">i.maxlik</a>,
<a href="i.rectify.html">i.rectify</a>,
<a href="i.ortho.photo.html">i.ortho.photo</a>
</em>


<h2>AUTHOR</h2>

Michael Shapiro,
U.S.Army Construction Engineering 
Research Laboratory
<br>
Parser support: Bob Covill (Tekmap, Canada)

<!--
<p>
<i>Last changed: $Date$</i>
-->
